Leafsnap: Leafsnap is the smartphone user's secret weapon to a more meaningful relationship with trees. It's incredibly simple and strangely addictive: find a tree, grab a leaf, snap a picture. The app scans its outline-parsing criteria like smooth or jagged edges, single- or many-lobed-and tells you what tree it thinks it came from. It's similar to the "whoa! this is the future" feeling you get when you deposit a check via smartphone.

Swiftkey X Beta: It's a fantastic keyboard replacement app. SwiftKey can scan SMS messages, Twitter timelines, Facebook statuses and Gmail to learn your writing style. And it can personalize your experience by letting you choose your own typing style. SwiftKey's always been pretty great and this new "next generation fluency inference engine" might be its best version yet. Free.

Jackass: Tens Years of Stupid: Jackass: Ten Years of Stupid for iPad is a behind the scenes look of the biggest Jackasses we know: Knoxville, Steve-O, Pontius, Wee-Man, etc. There's video clips, gross photos, and essays on the entire history of Jackass. It's awesome to re-watch some of the epic skits, look back on the history and see the creative-yeah, I said creative-process behind the show. There's also two super simple games to waste your time on too. $5